/***************************************************************************
*                                                                         *
*   This file is part of the Fotowall project,                            *
*       http://code.google.com/p/fotowall                                 *
*                                                                         *
*   Copyright (C) 2009 by Enrico Ros <enrico.ros@gmail.com>               *
*                                                                         *
*   This program is free software; you can redistribute it and/or modify  *
*   it under the terms of the GNU General Public License as published by  *
*   the Free Software Foundation; either version 2 of the License, or     *
*   (at your option) any later version.                                   *
*                                                                         *
 * ----------------------------------------------------------------------- *
 *																		   *
 *	Modifications for FotoKinect, Spring 2011 by Gianna Badiali,		   *
 *                                                   Gabriel Fernandez,	   *
 *                                                   Kelsey Tripp, and     *
 *                                                   Sam Swarr             *
 *																		   *
 ***************************************************************************/

#include "BezierCubicItem.h"
#include <QGraphicsEllipseItem>
#include <QGraphicsLineItem>
#include <QGraphicsPathItem>
#include <QGraphicsScene>
#include <QGraphicsSceneMouseEvent>
#include <QLineF>
#include <QPainter>
#include <QPainterPath>
#include <QPen>

class BezierControlPoint : public QGraphicsItem
{
public:
	BezierControlPoint(BezierCubicItem *, int index);

	// ::QGraphicsItem
	QRectF boundingRect() const;
	void mouseMoveEvent(QGraphicsSceneMouseEvent * event);
	void paint(QPainter * painter, const QStyleOptionGraphicsItem * option, QWidget * widget = 0);

private:
	BezierCubicItem * m_parent;
	int m_index;
};

class BezierControlLine : public QGraphicsLineItem
{
public:
	BezierControlLine(BezierCubicItem *);
};

class BezierCubicPath : public QGraphicsPathItem
{
public:
	BezierCubicPath(BezierCubicItem *);
};

BezierCubicItem::BezierCubicItem(QGraphicsItem * parent)
	: QGraphicsItem(parent)
{
	// customize item
	setFlag(ItemIsFocusable, false);
	setFlag(ItemClipsChildrenToShape, false);

	// children items (4 controlpoints, 2 dashed lines, 1 strong line)
	m_path = new BezierCubicPath(this);
	m_l1 = new BezierControlLine(this);
	m_l2 = new BezierControlLine(this);
	m_cps.resize(4);
	for (int i = 0; i < 4; i++) {
		m_cps[i] = new BezierControlPoint(this, i);
		m_cps[i]->setPos(-100 + qrand() % 200, -70 + qrand() % 140);
	}
	controlPointMoved(0);
	controlPointMoved(2);
}

QPainterPath BezierCubicItem::shape() const
{
	return m_path->path();
}

void BezierCubicItem::setControlPoints(const QList<QPointF> & points)
{
	if (points.size() != 4)
		return;
	for (int i = 0; i < 4; i++)
		m_cps[i]->setPos(points[i]);
	controlPointMoved(1);
	controlPointMoved(3);
}

QList<QPointF> BezierCubicItem::controlPoints() const
{
	QList<QPointF> cp;
	for (int i = 0; i < 4; i++)
		cp.append(m_cps[i]->pos());
	return cp;
}

QRectF BezierCubicItem::boundingRect() const
{
	return QRectF(-5, -5, 11, 11);
}

void BezierCubicItem::paint(QPainter * painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
{
	painter->setPen(QPen(Qt::red, 0.5));
	painter->setRenderHint(QPainter::Antialiasing, true);
	painter->drawLine(-5, 0, 5, 0);
	painter->drawLine(0, -5, 0, 5);
}

void BezierCubicItem::controlPointMoved(int index)
{
	// solid move
	if (index == 0 || index == 2) {
		QLineF l = index == 0 ? m_l1->line() : m_l2->line();
		if (!l.isNull())
			m_cps[index + 1]->setPos(m_cps[index]->pos() + QPointF(l.dx(), l.dy()));
	}

	// update line
	if (index < 2)
		m_l1->setLine(QLineF(m_cps[0]->pos(), m_cps[1]->pos()));
	else
		m_l2->setLine(QLineF(m_cps[2]->pos(), m_cps[3]->pos()));

	// update path
	QPainterPath path(m_cps[0]->pos());
	path.cubicTo(m_cps[1]->pos(), m_cps[3]->pos(), m_cps[2]->pos());
	m_path->setPath(path);
	emit shapeChanged(path);
}


/** BezierControlPoint **/
BezierControlPoint::BezierControlPoint(BezierCubicItem * parent, int index)
	: QGraphicsItem(parent)
	, m_parent(parent)
	, m_index(index)
{
	setFlags(ItemIsMovable);
	setZValue(2.1);
}

QRectF BezierControlPoint::boundingRect() const
{
	return QRectF(-7, -7, 15, 15);
}

void BezierControlPoint::mouseMoveEvent(QGraphicsSceneMouseEvent * event)
{
	if (event->buttons() == Qt::LeftButton) {
		setPos(mapToParent(event->pos()));
		m_parent->controlPointMoved(m_index);
	}
}

void BezierControlPoint::paint(QPainter * painter, const QStyleOptionGraphicsItem * /*option*/, QWidget * /*widget*/)
{
	painter->setPen(QColor(50, 100, 120, 200));
	painter->setBrush((m_index & 0x01) ? QColor(200, 200, 210, 120) : QColor(210, 100, 110, 120));
	painter->drawEllipse(boundingRect());
}


/** BezierControlLine **/
BezierControlLine::BezierControlLine(BezierCubicItem * parent)
	: QGraphicsLineItem(parent)
{
	QPen pen(QColor(50, 100, 120, 200), 1);
	QVector<qreal> dashes;
	dashes << 8 << 6;
	pen.setDashPattern(dashes);
	setPen(pen);
	setZValue(1.9);
}


/** BezierCubicPath **/
BezierCubicPath::BezierCubicPath(BezierCubicItem * parent)
	: QGraphicsPathItem(parent)
{
	QPen pen(QColor(200, 0, 0), 1);
	setPen(pen);
	setZValue(2.2);
}
